| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a crank device capable of easily changing a stroke of a reciprocating motion and not requiring any stopping in operation when the stroke is changed.SOLUTION: A crank device of this invention comprises coaxial two crank shafts 6 rotated in synchronization, crank pin 7 fixed at both ends to the opposing ends of the two crank shafts 6, and oscillating body 8 arranged between both crank shafts 6 having crank pin 7 rotatably engaged with it and supported and arranged in such a way it can be oscillated and displaced in a crossing direction in respect to an axial direction of the crank shafts 6 under a rotation of the crank pin 7. The crank pin 7 is inclined in respect to an axial direction of the crank shafts 6 and fixed to both crank shafts 6, arranged in such a way that it may be rotated to draw a conical orbit with one crank shaft 6 being applied as an apex, an engaging position between the oscillating body 8 and the crank pin 7 is moved to cause a stroke of the oscillating body 8 to be changed.</p> |
